Size of the dam: 100x 3 x 5 cm. It can be easily cut to the length you need. The long, flexible design creates all kinds of shapes. The shower barrier and retention system maintains the water within the threshold. Ideal for curbless showers and other areas where water must be contained. Please contact us with any questions about the collapsible dam. Customer Note: To make the product more stable, please follow the installation instructions to install the water retention strip. Installation steps and attentions: (1) First, please clean the floor thoroughly and keep it dry. This step is very important! (2) Afterwards, determine the installation position of the water retaining strip, and then mark it on the ground with a pen. (3) Remove the adhesive tape on the back of the water retaining strip and stick it on the floor according to the previously marked position. (4) Then use glue to fill the area where both ends of the tape contact the wall to seal it, and remove excess glue to make the contact smooth. (5) Finally, to prevent it from falls, allow it to dry within 24 hours and avoid contact with water. Good quality product